package com.zhiteng.utils.tencent.campus;

/**
 * 
* <p>Title: DecodeUtil.java</p>  
* <p>Description: 将从腾讯智慧校园拉取的数据中的ASCII码进行解码</p>  
* @author dragon  
* @date 2018年11月9日  
* @version 1.0
 */
public class DecodeUtil {
	public static String decodeUnicode(String theString) {  
        char aChar;  
        int len = theString.length();  
        StringBuffer outBuffer = new StringBuffer(len);  
        for (int x = 0; x < len;) {  
            aChar = theString.charAt(x++);  
            if (aChar == '\\') {  
                aChar = theString.charAt(x++);  
                if (aChar == 'u') {  
                    // Read the xxxx  
                    int value = 0;  
                    for (int i = 0; i < 4; i++) {  
                        aChar = theString.charAt(x++);  
                        switch (aChar) {  
                        case '0':  
                        case '1':  
                        case '2':  
                        case '3':  
                        case '4':  
                        case '5':  
                        case '6':  
                        case '7':  
                        case '8':  
                        case '9':  
                            value = (value << 4) + aChar - '0';  
                            break;  
                        case 'a':  
                        case 'b':  
                        case 'c':  
                        case 'd':  
                        case 'e':  
                        case 'f':  
                            value = (value << 4) + 10 + aChar - 'a';  
                            break;  
                        case 'A':  
                        case 'B':  
                        case 'C':  
                        case 'D':  
                        case 'E':  
                        case 'F':  
                            value = (value << 4) + 10 + aChar - 'A';  
                            break;  
                        default:  
                            throw new IllegalArgumentException(  
                                    "Malformed   \\uxxxx   encoding.");  
                        }  
      
                    }  
                    outBuffer.append((char) value);  
                } else {  
                    if (aChar == 't')  
                        aChar = '\t';  
                    else if (aChar == 'r')  
                        aChar = '\r';  
                    else if (aChar == 'n')  
                        aChar = '\n';  
                    else if (aChar == 'f')  
                        aChar = '\f';  
                    outBuffer.append(aChar);  
                }  
            } else  
                outBuffer.append(aChar);  
        }  
        return outBuffer.toString();  
    }
}
